Westminster Larger Catechism #175

Q. What is the duty of Christians, after they have received the sacrament of the Lord’s Supper?

A. The duty of Christians, after they have received the sacrament of the Lord’s Supper, is seriously to consider how they have behaved themselves therein, and with what success;1 if they find quickening and comfort, to bless God for it, 2 beg the continuance of it,3 watch against relapses,4 fulfill their vows,5 and encourage themselves to a frequent attendance on that ordinance:6 but if they find no present benefit, more exactly to review their preparation to, and carriage at, the sacrament;7 in both which, if they can approve themselves to God and their own consciences, they are to wait for the fruit of it in due time:8 but, if they see they have failed in either, they are to be humbled,9 and to attend upon it afterwards with more care and diligence.10